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des_encrypt.go
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/
des_encrypt.go
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package secret
import (
"crypto/cipher"
"crypto/des"
"encoding/hex"
"errors"
"fmt"
"github.com/spf13/cast"
)
const DesKeyLength = 8
var DesBaseSpecialSign = "!%$brgil%$kn&weruxl7c.de,fq8zm32#@1a4pgiw@a"
var DesBaseSpecialSignLength = len(DesBaseSpecialSign)
type DesEncrypt struct {
SpecialSign string // 加解密都会基于这一串字符,如果没有会基于 DesBaseSpecialSign.
Key string // 密钥,建议是 5-8位的密钥
}
func NewDesEncrypt(specialSign, key string) (*DesEncrypt, error) {
if specialSign == "" {
specialSign = DesBaseSpecialSign
}
specialSignLength := len(specialSign)
if len(specialSign) < DesKeyLength { // 小于8位填充
if len(specialSign)%2 == 0 {
specialSign += DesBaseSpecialSign[:DesKeyLength-specialSignLength]
} else {
specialSign += DesBaseSpecialSign[DesBaseSpecialSignLength-specialSignLength:]
}
} else if len(specialSign) > DesKeyLength { // 大于8位去除
if len(specialSign)%2 == 0 {
specialSign = specialSign[:DesKeyLength+1]
} else {
specialSign = specialSign[DesKeyLength-specialSignLength:]
}
}
if key == "" {
return nil, errors.New("need the key to encrypt, please add it. ")
}
return &DesEncrypt{
SpecialSign: specialSign,
Key: key,
}, nil
}
// getPrefix 根据长短来判断前缀
func (d *DesEncrypt) getPrefix(length int) string {
if len(d.SpecialSign)%2 == 0 {
return d.SpecialSign[len(d.SpecialSign)-length:]
}
return d.SpecialSign[:length]
}
// generateDesKey 生成DES密钥
func (d *DesEncrypt) generateDesKey(id interface{}) []byte {
idStr := cast.ToString(id)
length := DesKeyLength - len(idStr) - len(d.Key)
buf := make([]byte, 0, DesKeyLength)
prefix := d.getPrefix(length)
buf = append(buf, []byte(prefix)...)
buf = append(buf, []byte(idStr)...)
buf = append(buf, []byte(d.Key)...)
if len(buf) > 8 {
buf = buf[:DesKeyLength+1]
}
return buf
}
// SecretEncrypt 加密
func (d *DesEncrypt) SecretEncrypt(secret interface{}, fields ...interface{}) (string, error) {
number := 0
for i := range fields {
number += fields[i].(int)
}
if secret != "" {
desKey := d.generateDesKey(number)
ans, err := d.desEncrypt(cast.ToString(secret), desKey)
if err != nil {
return "", err
}
return ans, nil
}
return "", errors.New("need the secret to encrypt")
}
// SecretDecrypt 解密
func (d *DesEncrypt) SecretDecrypt(secret interface{}, fields ...interface{}) (string, error) {
number := 0
for i := range fields {
number += fields[i].(int)
}
if secret != "" {
aesKey := d.generateDesKey(number)
b, err := d.desDecrypt(cast.ToString(secret), aesKey)
if err != nil {
return "", nil
}
return string(b), nil
}
return "", errors.New("need the secret to decrypt")
}
func (d *DesEncrypt) desEncrypt(origData string, key []byte) (string, error) {
encodeByte := []byte(origData)
block, err := des.NewCipher(key)
if err != nil {
return "", err
}
encodeByte = pkcs5Padding(encodeByte, block.BlockSize())
blockMode := cipher.NewCBCEncrypter(block, key)
crypted := make([]byte, len(encodeByte))
blockMode.CryptBlocks(crypted, encodeByte)
hexStr := fmt.Sprintf("%x", crypted)
return hexStr, nil
}
func (d *DesEncrypt) desDecrypt(decodeStr string, key []byte) ([]byte, error) {
decodeBytes, err := hex.DecodeString(decodeStr)
if err != nil {
return nil, err
}
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
blockMode := cipher.NewCBCDecrypter(block, key)
origData := make([]byte, len(decodeBytes))
blockMode.CryptBlocks(origData, decodeBytes)
origData = pkcs5UnPadding(origData)
return origData, nil
}